Digestive tract: Food allergy symptoms may be associated with stomach cramps, vomiting and diarrhea. Food allergy may also be responsible for eczema, asthma, chronic rhinitis, ear problem, gastrointestinal distress, headache, fatique, hyperactivity and depression. In rare instances foods may cause a life-threatening systemic response called anaphylaxis. For instance peanut allergy can be so severe in some children and adults that it results in anaphylactic shock.

Ears: Symptoms of recurrent infection or fluid in the middle ear can be provoked by allergic reaction and eventually result in loss of hearing. Both airborne allergens and food allergy can plays a role in many instances.
Emotional factors: Although allergy is a physical disorder it can be aggravated by intense stress, fear, anxiety, anger, extreme aggravation, and other emotional strains.

Additional provoking factors: Some irritating substances like tobacco smoke, paint solvent, vehicle exhaust, diesel fumes, strong perfumes, chlorine in swimming pools and other chemicals can act as promoters of allergy and worsen the symptoms in many instances.